INSIGHTS INTO WEIGHT..

Weight is defined as the force exerted by a body due to gravity.The mechanisms involved in weight regulation in humans include genetic,behavorial,social and physiological factors.The stability of body weight and body composition requires that energy intake matches energy expenditure.which way the balance shifts in a continous FIGHT.

Like any other natural entity, human body must obey physical laws, according to which energy cannot be created nor destroyed, but only transformed. Consequently, all excess energy introduced causes an increase of adipose tissue, which is always accompanied by an increase of lean body mass, and thus an increase of body weight weight gained or lost by a person with normal body weight is composed of two-thirds adipose tissue and one-third lean body mass.

How long does it take to gain or lose a kilogram? It evidently depends on how many Calories are cumulatively necessary to build a new kilogram of body weight and, vice versa, on how many Calories are provided by the demolition of one kilogram of existing body weight. The energy cost of adipose tissue and lean body mass correspond to about 10,000 and 2,000 Cal/kg, and the energy yield to about 7,500 and 800 Cal/kg, respectively. Therefore, energy cost and yield of one kilogram of weight with the above-mentioned composition (two-thirds adipose tissue and one-third lean body mass) are equivalent to about 7,000 and 5,400 Calories, respectively.so if one has to shed 5 kgs (35000 calories) one can theoretically loose it in 35 days with a calorie deficit of 1000 calorie per day. However, energy balance is positive or negative by 100 Cal/day only initially, then it gradually reduces because the body energy expenditure changes according to the consumption of the weight gained or lost. Times for gain or loss are consequently lengthened. However, 75% of the total weight is gained or lost in little more and little less than one year, respectively.